thumb|Kairos relief, copy of Lysippos, in Trogir (Croatia) thumb|Kairos as portrayed in a 16th-century fresco by Francesco Salviati Kairos () is an ancient Greek word meaning 'the exact or critical t
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9732dc93de05e65ba88b855648870c1075b364893fab0e34eb06b8faddb8e3f. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6ff16269-22b5-4c5a-8e29-afeefc4075d2.json and https://artists.proofprofile.net/proofs/artist/6ff16269-22b5-4c5a-8e29-afeefc4075d2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6947f6ab29e37dce8ff54b0000c369a0994911b22009ea65406f975455c5df81. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB8KE1550134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a00a86d37eed6845d96d23fcf38c5795cb706660838e1da834aea6b9fed606. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1560639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f100216af2981c04d2eb5ec5a48dcebf1a6bab76b0f08b44ac1e7687393349e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1560640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8edd03bdd413acc45b8efeb2d34a29c0cd285d9e87dc17d95c5fbde431366609. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1560641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88684bb0246d67ff9a6ef085d579f8a4b95050e6634f4295e58bab55abf7be1c. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1560642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c16947ca0a529e3d52c5052afc219cf2c41b15f811cc4a718548d12f9194aa. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1560643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055c9a4c8f58d12e57feae66a4a265aa10cdc680aeeca0e9a522844bdb3e25f0. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1560644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb2bf41a38d8783633c0b900d66e81ce6d1bc061cb59f8141f12fc6572b200b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1560645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17842fe95375fb4a1716fefe0502701f81a3fc30c3afd5f7ca3dcfb3ce13fd17. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1560646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0410d963e944f15b39964fb86c4bb97c6ff6e7e0306c4b9affb049eb3a5eaf16. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1560647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46cc2e554e04f6139dcf09f8fd2a72aa824fe957eca90c747e049a3441c8851b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1560648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fc4e2c452d23dbb7c66098a942615ebe8544ea3074c742b8c8c4aaac99eb70. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1560649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaeef21a011b0b2b58b63507fa28782a1bfa50fd0fb98178e8038beca96a98b1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1560650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08eed8db3069cea2a009a07cc38224d5764a82cb13b5436e9de95ebf3df0c954. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1560651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46320ab5707de5442912eba23855762c9df44397fdc0130b18b000227f3b6b26. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB8KE1358212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1ac0eeba8d9a2a6864fafa4084f19154b75647488ac4f3fed2f482d5a23acf. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB8KE1552624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20346faff54a8f98d5a8465256f946537b2008cc7b23960cf44510fb2f58118. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB8KE1552626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3adb11b53956f20d508bf517f888074c466704923a1df8279743bcac67a5cf2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1303358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893eb8e20d8554d14a3d6fd837b4e6db8eda64951cb5fd951d621f2ba117902f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU1874175.
Terabyte Records presents: Spring Syntax